'Great Garbage Patch' Not So Great After All

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It's been called the Great Garbage Patch and "the most shocking
thing" Oprah has ever seen: a massive island of plastic in the
Pacific Ocean that, according to many reports, is twice the size
of Texas, outnumbers plankton, and has killed millions of sea
birds.

But many of those claims, according to a new analysis, are huge
exaggerations. Others are downright false.

Plastic is definitely a problem in the oceans, both for animal
life and the environment, said Angel White, a microbial
oceanographer at Oregon State University in Corvallis. But there
are not floating towers of milk jugs, toilet seats and rubber
duckies swirling in the middle of the ocean.

Instead, the majority of plastic in the sea consists of
confetti-like specks that are spread out widely and nearly
impossible to see with the naked eye.

Setting the record straight about what's out there is key to
regaining the trust of a wary public, White said. In 2008, she
joined an expedition with the Center for Microbial Oceanography:
Research and Education. It was a boat trip from Hawaii to
California, through the heart of the Great Pacific Garbage Patch.

"None of us on that cruise had been to the patch, but we had all
heard that it's twice the size of Texas. That's in a textbook,"
she said. "These statements are so frequent and in so many places
that they are accepted as fact. But they undermine the
credibility of those advocating for reduction of plastic
pollution in the terrestrial and marine environments."

"Plastic is everywhere," and it's insidious, she said. "But it's
not a patch."

White's main goal on the research cruise was to look at
relationships between plastic and marine microbes. Along with
experiments on microbial respiration and productivity rates, she
and colleagues tediously counted and sorted pieces of plastic
that were caught in nets towed behind the boat.

When the scientists extrapolated their results into estimates of
how much plastic is swirling in ocean gyres, their numbers were
just about the same as what other studies have found. But those
numbers don't match up with the imagery often described in the
media, White said. She has presented her findings to other
experts and is preparing a paper for publication.

"You might see a piece of Styrofoam or a bit of fishing line
float by at random intervals after hours or 20 minutes, but
greater than 90 percent of the plastic was less than 10
millimeters in diameter," she said. "If you filled a thousand
Nalgene water bottles in the North Pacific, three to five would
have one piece of plastic in them the size of an eraser."

On an expedition through the garbage patch last summer with the
Sea Education Association and the Woods Hole Oceanographic
Institution, author and biogeographer David M. Lawrence noticed a
similar pattern. Most of the plastic their boat picked up was
tiny, widely dispersed and invisible to the naked eye.

"I was under the impression that you had these big
conglomerations that were like Empire State buildings-tall," said
Lawrence, who's based in Mechanicsville, Va., and was not
surprised by White's analysis. "But that's not what it's like."

Even as the garbage patch fails to live up to the hype of a
floating continent, Lawrence added, the truth might actually be
worse and far more insidious. Compared to a big mound of trash,
for one thing, it's impossible to clean up tons of tiny and
widespread specks of plastic. You can't just scoop them up.

Without a dramatic metaphor expressed in "units Texas," White
said, it also becomes more challenging to define the extent of
the problem to the public. Even scientists still don't know how
deep the plastic goes or how much of it is now sitting on the
seafloor.

Still, small bits of plastic pose a variety of threats to the
environment. They often end up inside fish and can work their way
up the food chain. And plastics that are exposed to the elements
release chemicals as they break down -- all with unknown but
worrisome consequences for animals, water quality and human
health.

"There is no reason to have plastic in the marine environment,"
White said. "But I think we undermine the issue by overstating
the results. It's like crying wolf. That's the danger."